Cirstea reached her first Roland Garros quarter-final in 17 years. She is retiring at the end of the season but is in the form of her life after she became the oldest player to break into the top 20 earlier this month.
The 36-year-old reached two semi-finals during the clay court swing and beat world No.1 Aryna Sabalenka in Rome. She also became the oldest player in the Open Era to claim a 6-0 6-0 win in a Grand Slam main draw in a third-round victory over Solana Sierra.
Cirstea dominated the opening set, breaking twice to surge into a 5-1 lead. Wang fought back from 5-2 down to force a tiebreak where Cirstea found a second wind to win in 84 minutes.